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Movements within early East Gondwana dispersal are poorly constrained, and\udthere is debate about conjugate geologic structures and the timing and\uddirections of the rifting and earliest seafloor spreading phases. We present\uda combined structural interpretation of multichannel reflection seismic\udprofiles from offshore of northern Mozambique (East Africa) and the conjugate\udRiiser-Larsen Sea (Antarctica). We find similar structural styles at the\udmargins of both basins. At certain positions at the foot of the continental\udslope close to the continent–ocean transition, the basement is intensely\uddeformed and fractured, a structural style very untypical for rifted\udcontinental margins. Sediments overlying the fractured basement are deformed\udand reveal toplap and onlap geometries, indicating a post-breakup\uddeformation phase. We propose this unique deformation zone as a tie point for\udGondwana reconstructions. Accordingly, we interpret the western flank of\udGunnerus Ridge, Antarctica as a transform margin similar to the Davie\udRidge offshore of Madagascar, implying that they are conjugate features. As the\udcontinental slope deformation is post-rift, we propose a two-phase opening\udscenario. A first phase of rifting and early seafloor spreading, likely in\udNW–SE direction, was subsequently replaced by a N–S-directed transform\uddeformation phase overprinting the continent–ocean transition. From\udpreviously identified magnetic chrons and the sediment stratigraphy, this\udchange in the spreading directions from NW–SE to N–S is suggested to have\udoccurred by the late Middle Jurassic. We suggest that the second phase of\uddeformation corresponds to the strike-slip movement of Madagascar and\udAntarctica and discuss implications for Gondwana breakup

Tie points for Gondwana reconstructions from a structural interpretation of the Mozambique Basin, East Africa and the Riiser-Larsen Sea, Antarctica